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ENSO dynamics: Low-dimensional-chaotic or stochastic?
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
2013 (English)In: Journal of Geophysical Research-Atmospheres, ISSN 2169-897X, Vol. 118, no 5, 2161-2168 p.Article in journal (Refereed) Published
Abstract [en]

We apply a test for deterministic, low-dimensional, and nonlinear dynamics to the Nino 3 time series for the El Nino Southern Oscillation (ENSO). The test is positive if the time series includes the seasonal variation, but negative if it only represents the anomaly, i.e., the deviation from the seasonal cycle. The results indicate that deterministic, low-dimensional, and nonlinear dynamics in ENSO is associated with the seasonal cycle, and that the dynamics determining the interannual timing and strength of El Nino/La Nina episodes is high-dimensional/stochastic. Application of stochastic forcing to a time-delay equation for equatorial-wave dynamics can reproduce stochastic dynamics and other important aspects of ENSO. Without such stochastic forcing, this model yields deterministic, low-dimensional dynamics. With stochastic forcing, our test still yields such dynamics if the seasonal cycle is retained, but does not if the annual cycle is subtracted before the test is applied. The model results illustrate that the seasonal variability can be governed by low-dimensional nonlinear dynamics, while the interannual variability associated with ENSO is dominated by the stochastic forcing.

Place, publisher, year, edition, pages
2013. Vol. 118, no 5, 2161-2168 p.
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-200368DOI: 10.1002/jgrd.50190ISI: 000317842800006OAI: oai:DiVA.org:uu-200368DiVA: diva2:623438
Available from: 2013-05-27 Created: 2013-05-27 Last updated: 2013-05-27Bibliographically approved

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Zivkovic, Tatjana
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Swedish Institute of Space Physics, Uppsala Division
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